From 6086d4193ef71aa0c6c1bc7c9609d56d9915e188 Mon Sep 17 00:00:00 2001
From: Joona Aalto <jondolf.dev@gmail.com>
Date: Tue, 2 Jan 2024 18:46:03 +0200
Subject: [PATCH] Implement `Neg` for `Direction2d` and `Direction3d` (#11179)

# Objective

I frequently encounter cases where I need to get the opposite direction.
This currently requires something like
`Direction2d::from_normalized(-*direction)`, which is very inconvenient.

## Solution

Implement `Neg` for `Direction2d` and `Direction3d`.
---
 crates/bevy_math/src/primitives/dim2.rs | 7 +++++++
 crates/bevy_math/src/primitives/dim3.rs | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/crates/bevy_math/src/primitives/dim2.rs b/crates/bevy_math/src/primitives/dim2.rs
index fbb7811cfb..8b34a100eb 100644
--- a/crates/bevy_math/src/primitives/dim2.rs
+++ b/crates/bevy_math/src/primitives/dim2.rs
@@ -58,6 +58,13 @@ impl std::ops::Deref for Direction2d {
     }
 }
 
+impl std::ops::Neg for Direction2d {
+    type Output = Self;
+    fn neg(self) -> Self::Output {
+        Self(-self.0)
+    }
+}
+
 /// A circle primitive
 #[derive(Clone, Copy, Debug)]
 pub struct Circle {
diff --git a/crates/bevy_math/src/primitives/dim3.rs b/crates/bevy_math/src/primitives/dim3.rs
index 0177d03fc3..93b92fbc6c 100644
--- a/crates/bevy_math/src/primitives/dim3.rs
+++ b/crates/bevy_math/src/primitives/dim3.rs
@@ -58,6 +58,13 @@ impl std::ops::Deref for Direction3d {
     }
 }
 
+impl std::ops::Neg for Direction3d {
+    type Output = Self;
+    fn neg(self) -> Self::Output {
+        Self(-self.0)
+    }
+}
+
 /// A sphere primitive
 #[derive(Clone, Copy, Debug)]
 pub struct Sphere {